Among rotationally variable stars, we can also find ellipsoidal variables, that is stars in non-eclipsing binary system that are tidally deformed and due to gravitational darkening they can also show brightness variations as the stars orbit around the common center of mass [1]}, [2]}. For completeness, we should not forget to mention classical variable stars such as RR Lyrae stars [3]} and systems containing the intrinsic variable stars mentioned above, such as eclipsing binaries and exoplanetary candidates. Flare-like events have also been observed in A-type stars [4]}. However, [5]} found out that the flares can come from a nearby stars and companions in binary systems putting doubts on the flares among A-type stars.
